book Maths Puzzle Numerical Ability

Find two consecutive positive integers such that the sum of
their squares is 85.

I got 6,7...is that correct/

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book Other Question

I DON"T GET ALGEBRA AT ALL!!!! can somebody help me? this also for percentages. Suppose that an isosceles triangle has sides of length a,a, and b and is such that cos(2A)=sin(B). Show that sin^2(B)= -2sin(A)cos(A)cos(B).